How can I get my Apple ID back?

You need to have Apple reactivate the account. Please contact official Apple Support for help with an "inactive" Apple ID. The people responding on this forum are Apple product users like yourself and cannot do anything with your account.

You can reach Apple Support using this link --> Contact - Official Apple Support

or by telephone at one of the numbers in this support article --> Contact Apple for support and service - Apple Support

Note that having an "inactive" account is not the same as having a disabled account. If your account says it is "disabled", see this article --> If your Apple ID is locked or disabled - Apple Support

When posting here always include basic information. This will assist us in quickly finding a specific answer to your question instead of guessing. Provide a clear description of what you are trying, where it fails to perform as expected, and the exact wording of error messages. Include your hardware year and model information if you have not already done so in the posting information.